What is the working principle of the code type pre paid water meter?
LCD query: press the query key, the user can learn from the LCD screen on their use (cumulative usage, purchase times, current margin, the latest amount of purchase).
Automatic argument: the controller is rejected and the number of errors recorded when the error data is entered. If 8 consecutive input errors, the control system is fully closed, and only the operator can unlock to recover.
Emergency overdraft: according to the needs, operators can set the corresponding amount of overdraft amount, press the start button, users can emergency use. When the emergency dosage is used up, turn off the valve automatically and no longer respond to the overdraft function. After the new amount is purchased, the overdraft amount is deducted first.
Eliminate arrears: when the purchase amount to 0, the controller automatically closes the valve. Users need to buy them in time and enter code to use them.
Prompt function: with input data error indication, battery shortage indication, actuating mechanism closing indication.
